I have a variable which either can take string or null, currently i am defining all the type values hardcoded as below

  let name : 'Ram' | 'Shyam' | 'Paul' | null = null;
  name = customer.name as 'Ram' | 'Shyam' | 'Paul' | null;

Here, the values are hardcoded, how can i make it generic so that it can intake anything old and new both.

I have a variable which either can take string or null, currently i am defining all the type values hardcoded as below

  let name : 'Ram' | 'Shyam' | 'Paul' | null = null;
  name = customer.name as 'Ram' | 'Shyam' | 'Paul' | null;

Here, the values are hardcoded, how can i make it generic so that it can intake anything old and new both.

• javascript
• typescript

Share Improve this question Follow asked Aug 25, 2020 at 6:04 LaraLara 3,03199 gold badges4444 silver badges8181 bronze badges

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2 Answers 2

Sorted by: Reset to default 7

You can check this one

type MyValue = "A" | "B" | "C"
type Nullable<T>  = T | null

const a: Nullable<MyValue> = null

Just declare a custom type

type names = 'Ram' | 'Shyam' | 'Paul' | null;

let name: names = null;